American Dryer Corp. AD-115ES - Manual (Page 61)

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U. Dryer or scraping noise at basket (tumbler) area...
1. Check for object caught in basket (tumbler) or wrapper area.
2. Basket (tumbler) is out of proper alignment ...
a. Check both vertical and lateral alignment.
b. Check gap between front panel and basket (tumbler) front...set screws may have come loose, and basket
(tumbler) walked forward or backwards.
3. Loose tumbler (basket) tie rod.
4. Failed tumbler (basket) support.
V. Excessive noise or vibration...
1. Dryer not leveled properly.
2. Impellor (fan/blower) out of balance ...
a. Excessive lint build up on impellor (fan/blower).
b. Failed impellor (fan/blower).
3. Loose tumbler (basket) tie rod.
4. Tumbler (basket) out of adjustment, or adjustment bolts (hardware) are loose.
5. Failed tumbler (basket) support.
6. Loose motor mount.
7. Failed idler or tumbler bearings.
8. V-belts either too tight or too loose.